The scenario watches for new emails in почта, takes the attachments, uploads them to vkCloudS3 and sends a confirmation to vk.
Automating vkCloudS3 and vk takes no code: a ready-made scenario does the routine for you.
You can launch this vkCloudS3 + vk integration in Scriptera: describe the task in plain words — the scenario is built, launched and monitored for you.